ctfdwdiff: Simple shell script for testing the CTF encoder/decoder

First it gets a file with DWARF info, converts that to CTF and adds
a ".SUNW_ctf" ELF section to the file with DWARF info. Double debugging
foo! Pay for one, take two!

For tcp_input.o for instance, the result is:

[acme@doppio pahole]$ cat /tmp/tcp_input.o.diff
--- /tmp/tcp_input.o.ctf.c	2009-03-19 19:48:23.000000000 -0300
+++ /tmp/tcp_input.o.dwarf.c	2009-03-19 19:48:23.000000000 -0300
@@ -1811,7 +1811,7 @@

 	/* XXX 6 bytes hole, try to pack */

-	void (*call)(const struct marker *, void *);	  /* 24  8 */
+	void (*call)(const struct marker *, void *, ...); /* 24  8 */
 	struct marker_probe_closure single;		  /* 32 16 */
 	struct marker_probe_closure * multi;		  /* 48  8 */
 	const char  *               tp_name;		  /* 56  8 */
[acme@doppio pahole]$

Now back to figuring out how to encode a VARARGS marker in CTF...

Ah, to use the script just do:

./ctfdwdiff foo.o

Some will crash, but we're working hard for fuller customer
satisfaction.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

ctfdwdiff

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+obj=$1
+pahole -Z $obj
+pahole -F ctf $obj > /tmp/$obj.ctf.c
+pahole -F dwarf $obj > /tmp/$obj.dwarf.c
+diff -u /tmp/$obj.ctf.c /tmp/$obj.dwarf.c > /tmp/$obj.diff
+vim /tmp/$obj.diff